diff --git a/apps/dav/lib/UserMigration/ContactsMigrator.php b/apps/dav/lib/UserMigration/ContactsMigrator.php
index ae1a61ce4f400..d2ba82eb2e5e3 100644
--- a/apps/dav/lib/UserMigration/ContactsMigrator.php
+++ b/apps/dav/lib/UserMigration/ContactsMigrator.php
@@ -131,6 +131,10 @@ private function getAddressBookExportData(IUser $user, array $addressBookInfo, O
 			}
 		}
 
+		if (count($vCards) === 0) {
+			throw new InvalidAddressBookException();
+		}
+
 		return [
 			'name' => $addressBookNode->getName(),
 			'displayName' => $addressBookInfo['{DAV:}displayname'],